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During astronaut Scott Kelly's year in space, scientists will compare his physiology with that of his twin brother, Mark, to study the effect of prolonged space flight on the human body.

San Diego engineers built crucial parts of NASA's spacecraft, and Navy ships stationed here will haul it ashore after it splashes down in the Pacific Ocean.

Recent studies have found that background checks can help curb gun violence. In recent shootings, though, evidence is tougher to see.

Many people have worried that Ebola could evolve into a more deadly virus — or start spreading through the air. A study published Thursday alleviates these concerns.

Don't call it a comeback: Blocks have been here for more than 100 years. Studies have shown they can help build language and cognition skills — and even help teach math.

Representing fields from chemistry to poetry, the 24 MacArthur Foundation Fellows will each receive $500,000 over the next five years.

In a new study of mice, San Diego researchers show that timing of meals can be as important as what's on the plate.

5 million students took new, Common Core-aligned tests this Spring through the PARCC consortium. Now begins the rush to set cut scores — to sort students by performance.

Palomar Hospital also was fined for a patient's death following a fall

The city fathers didn't understand the plague they faced in the Middle Ages. Yet they improvised brilliantly. A new paper explains how their mindset is a model for how to face an unknown threat.